Spore Shedding Vascular Plants Psilotum Lycopodium Equisetum Huperzia

Spore Shedding Vascular Plants Psilotum Lycopodium Equisetum

Huperzia a forest wetlands dwelling lycophyte These plants are the diploid sporophyte

Huperzia lucidula a wetlands-dwelling lycophyte http: //www. duke. edu/~jspippen/plants/lycopodium-lucidulum 060727 -3857 bchmtnz. jpg

Huperzia root cross-section epidermis cortex protoxylem metaxylem phloem amphiphloic plectostele exarch

Protosteles: haplosteles actinostele plectostele Siphonosteles: siphonostele solenostele dictyostele cortex phloem xylem pith leaf gap leaf trace eustele dicot stem atactostele monocot stem

microphyll sporangium spores stem gemma http: //home. manhattan. edu/~frances. cardillo/plants/v ascular/lucidum 6. jpg last year’s sporophylls

Huperzia root cross-section with branch root cross sections

Huperzia microphyll cross section mesophyll cutinized epidermis vascular bundle stoma

http: //www. twofrog. com/images/groundpine 58. jpg Lycopodium obscurum a forest-dwelling lycophyte The sporophylls are organized into a terminal strobilus.

Lycopodium obscurum sporophytes demonstrate dichotomous branching. Microphylls are spirally arranged with some flattening of the branch system. Lycopodium obscurum strobili are not interrupted by microphylls. Sporophylls are not photosynthetic.

Strobilus Longisection sporophyll sterile jacket spores (1 N) stalk sporangium All the spores are the same small size, so Lycopodium is homosporous. The spores are shed into the wind.

Lycopodium gametophytes may be photosynthetic http: //www. cas. vanderbilt. edu/bioimages/l/wlyal 5 -gamicro 16920. JPG

The sperm is flagellated and chemotactic http: //www. botany. hawaii. edu/faculty/webb/bot 311 -00/Lyco. Repro/Lycopodium_sperm. jpg

Diphasiastrum complanatum a forest-dwelling lycophyte http: //www. duke. edu/~jspippen/plants/lycopodium-digitatum 060709 -8672 alamancez. jpg

http: //128. 253. 177. 181/users/robbin/9_7_05/upload 90/Lycopodiella_X_gilmanii_ME 48. JPG Lycopodiella alopecuroides a grassland dwelling lycophyte

Lycopodium innundatum a bog-dwelling lycophyte http: //farm 2. static. flickr. com/1270/1048564007_47 acf 0621 a. jpg? v=0

Rhynia was a Psilotum-like swamp dwelling organism living with Protolepidodendron, the herbaceous ancestor of woody Lepidodendron in swamps during the Devonian period.

Lepidodendron was a large lycophyte tree living in marshes. Dead plants and spores built up in the peat of the marshes, were later overrun with sediments, and by heat and pressure were converted to coal.